Skip to navigation
Skip to content
MENU
R.K. Enterprise
Search for:
Search
My Account
Customer Help
Checkout
Search for:
Search
Home
Products
Fuses
Ferraz Shawmut Fuse
Coopper Bussmann
Sitor Fuse
Jean Muller
PLC
Siemens PLC
ABB PLC
Allen-Bradly PLC
Mitsubushi PLC
IGBT Module
ABB IGBT
Semikron IGBT Modules
Air Circuit Breaker
ABB Air Circuit Breaker
Siemens Air Circuit Breaker
L&T Air Circuit Breaker
About
Contact us
Home
/
Shop
/
PLC
/
Siemens PLC
/
S7-400 PLC
/
S7-400 Modules
/
Digital Modules
/
SM421
SM421
Show Filters
Default sorting
Sort by popularity
Sort by latest
Sort by price: low to high
Sort by price: high to low
Showing all 6 results
Digital Modules
,
PLC
,
S7-400 Modules
,
S7-400 PLC
,
Siemens PLC
,
SM421
6AG1421-1BL01-2AA0
Read more
Digital Modules
,
PLC
,
S7-400 Modules
,
S7-400 PLC
,
Siemens PLC
,
SM421
6ES7421-1BL01-0AA0
Read more
Digital Modules
,
PLC
,
S7-400 Modules
,
S7-400 PLC
,
Siemens PLC
,
SM421
6ES7421-1EL00-0AA0
Read more
Digital Modules
,
PLC
,
S7-400 Modules
,
S7-400 PLC
,
Siemens PLC
,
SM421
6ES7421-1FH20-0AA0
Read more
Digital Modules
,
PLC
,
S7-400 Modules
,
S7-400 PLC
,
Siemens PLC
,
SM421
6ES7421-7BH01-0AB0
Read more
Digital Modules
,
PLC
,
S7-400 Modules
,
S7-400 PLC
,
Siemens PLC
,
SM421
6ES7421-7DH00-0AB0
Read more
Show Filters
Default sorting
Sort by popularity
Sort by latest
Sort by price: low to high
Sort by price: high to low
Showing all 6 results
